Dr Sharp is right. That 5EAT is going to need a lot of money invested in order to handle that power you are shooting for (If you can adapt it to fit). Even at an optimistic 350ft-lb you should be investing at least $800 for a valve body mod. Much more power than that and you should be looking at an IPT built tranny which will set you back around 5 grand. I'm not sure if you have a trick up your sleeve but this is probably the reason I will never go much farther than stage 2 in one of these vehicles.